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[GOVCMSD8-556]: Add read replica access. #83

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merged 5 commits into from
May 5, 2020
Merged

[GOVCMSD8-556]: Add read replica access. #83

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2e51a3c
# This is a combination of 3 commits.
steveworley Jan 20, 2020
710663c
Add read replica access.
steveworley Jan 20, 2020
e938d20
Update to split on space as per PR.
steveworley Jan 20, 2020
48ad556
Merge branch 'develop' into feature/read-replica
Apr 27, 2020
6d28633
Fixed added replicas in databases array. (#151)
AlexSkrypnyk Apr 28, 2020
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21 changes: 19 additions & 2 deletions .docker/images/govcms8/scripts/govcms-deploy
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,20 @@ mkdir -p /app/web/sites/default/files/private/tmp/
config_count=`ls -1 /app/config/default/*.yml 2>/dev/null | wc -l`
dev_config_count=`ls -1 /app/config/dev/*.yml 2>/dev/null | wc -l`

# Database options to configure the remote to use the read replica when
# performing read operations.
sync_opts=""
read_replica_enabled () {
if [[ -z "$MARIADB_READREPLICA_HOSTS" ]]; then
return
fi

if tables=$(drush @govcms.prod sqlq 'show tables;' --database=read 2> /dev/null) && [ -n "$tables" ]; then
echo "Replica is available, using for database operations."
sync_opts="--source-database=read"
fi
}

# Database updates, cache rebuild, optional config imports.
common_deploy () {
drush updb -y
Expand All @@ -41,11 +55,14 @@ common_deploy () {

# Non production environments.
if [[ "$LAGOON_ENVIRONMENT_TYPE" != "production" ]]; then

read_replica_enabled $sync_opts

if ! drush status --fields=bootstrap | grep -q "Successful"; then
# Import prod db in Lagoon development environments.
if [[ ! -z "$LAGOON_ENVIRONMENT_TYPE" && "$LAGOON_ENVIRONMENT_TYPE" != "local" ]]; then
drush sql-drop -y
drush sql-sync @govcms.prod @self -y
drush sql-sync @govcms.prod @self $sync_opts -y
common_deploy
else
echo "Drupal not installed."
Expand All @@ -55,7 +72,7 @@ if [[ "$LAGOON_ENVIRONMENT_TYPE" != "production" ]]; then
if [[ "$GOVCMS_TEST_CANARY" = TRUE ]]; then
echo "GOVCMS_TEST_CANARY is set, syncing the database."
drush sql-drop -y
drush sql-sync @govcms.prod @self -y
drush sql-sync @govcms.prod @self $sync_opts -y
fi
common_deploy
fi
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31 changes: 29 additions & 2 deletions .docker/images/govcms8/settings/settings.php
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Expand Up @@ -108,16 +108,43 @@ public function __toString() {

// Lagoon Database connection
if (getenv('LAGOON')) {
$databases['default']['default'] = [
$db_conf = [
'driver' => 'mysql',
'database' => getenv('MARIADB_DATABASE') ?: 'drupal',
'username' => getenv('MARIADB_USERNAME') ?: 'drupal',
'password' => getenv('MARIADB_PASSWORD') ?: 'drupal',
'host' => getenv('MARIADB_HOST') ?: 'mariadb',
'port' => 3306,
'charset' => 'utf8mb4',
'collation' => 'utf8mb4_general_ci',
];


$databases['default']['default'] = array_merge($db_conf, [
'host' => getenv('MARIADB_HOST') ?: 'mariadb'
]);

if (getenv('MARIADB_READREPLICA_HOSTS')) {
$replica_hosts = explode(' ', getenv('MARIADB_READREPLICA_HOSTS'));
$replica_hosts = array_map('trim', $replica_hosts);

if (!empty($replica_hosts)) {
// Add a standalone connection to the read replica. This allows Drush to target
// the readers directly with --database=read.
$databases['read']['default'] = array_merge($db_conf, [
'host' => $replica_hosts[0],
]);

foreach ($replica_hosts as $replica_host) {
// Add replica support to the default database connection. This allows services
// to use the database.replica service for particular operations.
// @TODO: Lagoon should expose MARAIDB replica hosts as an array so we can
// scale the replicas horizontally.
$databases['default']['replica'][] = array_merge($db_conf, [
'host' => $replica_host,
]);
}
}
}
}

// Lagoon Solr connection
Expand Down